/*
 * 上应小风筝  便利校园，一步到位
 * Copyright (C) 2022 上海应用技术大学 上应小风筝团队
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import 'package:tuple/tuple.dart';

List<String> extractTitle(String fullTitle) {
  List<String> result = [];

  int lastPos = 0;
  for (int i = 0; i < fullTitle.length; ++i) {
    if (fullTitle[i] == '[' || fullTitle[i] == '【') {
      lastPos = i + 1;
    } else if (fullTitle[i] == ']' || fullTitle[i] == '】') {
      final newTag = fullTitle.substring(lastPos, i);
      if (newTag.isNotEmpty) {
        result.add(newTag);
      }
      lastPos = i + 1;
    }
  }

  result.add(fullTitle.substring(lastPos));
  return result;
}

List<String> cleanDuplicate(List<String> tags) {
  return tags.toSet().toList();
}

Tuple2<String, List<String>> splitTitleAndTags(String fullTitle) {
  final titleParts = extractTitle(fullTitle);
  var realTitle = titleParts.isNotEmpty ? titleParts.last : "";
  /*if (realTitle.startsWith(RegExp(r'[:：]'))) {
    realTitle = fullTitle.substring(1);
  }*/
  if (titleParts.isNotEmpty) titleParts.removeLast();
  final tags = cleanDuplicate(titleParts);
  return Tuple2(realTitle, tags);
}
